5 0 0 0 OA 異物混入による亜酸化窒素ガスに対する触媒効果の調査
- 著者
- 永井 佑弥 渡辺 謙太郎 和田 豊
- 出版者
- 一般社団法人 日本機械学会
- 雑誌
- 年次大会 2020 (ISSN:24242667)
- 巻号頁・発行日
- pp.J19102, 2020 (Released:2021-03-25)
1 0 0 0 パルスデトネーションエンジンの推進性能と輸送性能
- 著者
- 苅田 丈士 片野 克哉 緒川 修治
- 出版者
- 一般社団法人 日本機械学会
- 雑誌
- 年次大会 2020 (ISSN:24242667)
- 巻号頁・発行日
- pp.J19108, 2020 (Released:2021-03-25)
Pulse detonation engine (PDE) performances were calculated. Simple relationships were derived for detonation, exhausting and ventilation to calculate the engine performances. Calculated Isp were about 20 km/s in subsonic flight and 5 km/s in supersonic flight, respectively. A spaceship with PDE and a rocket engine was conceptually designed, and its transportation performance was estimated with use of the extended Tsiolkovskii method. When the mass at take-off was 3,000 kg, 2,230 kg was carried to the altitude of 101 km.
1 0 0 0 小径・低レイノルズ数における衝突噴流の熱伝達特性の研究
- 著者
- 松田 昇一 加藤 純郎 秋葉 貴光
- 出版者
- 一般社団法人 日本機械学会
- 雑誌
- 年次大会 2020 (ISSN:24242667)
- 巻号頁・発行日
- pp.S05406, 2020 (Released:2021-03-25)
Impingement jets are often used for cooling and heating of a surface or a body because a high heat transfer coefficient is obtained near the stagnation point of an impingement surface. For example, they are used for drying paper and fabrics, cooling gas turbine blades and electronic components(1). Recently, the usage of impingement jets can be predicted to be used in comparatively small spaces due to the miniaturization of devices. In these cases, the nozzle diameter, the flow rate, and the distance between the nozzle and the impingement plate are inevitably small.The purpose of this study is to clarify the flow and heat transfer characteristics when an impingement jet is applied in a narrow space. And now, when the heat transfer coefficients are measured by using the thin heated surface, a heat loss (qe) occurs in the in-plane direction of the heated surface due to heat conduction. Generally, this heat loss is often ignored at high Reynolds number (Re) and large diameter, because it is very small compared to the heat taken by the impingement jet. However, it may not be negligible in the case of a low Reynolds number and small diameter, because the heat taken by the impingement jet become relatively small.In this research, heat transfer characteristics using a circular impinging jet, which impinge on the heated plate, were investigated experimentally. The jet holes with the diameters D of 1, 3 and 5 mm were used. The values of H/D were from 2 to 6, where H is the distance between the nozzle exit and the impingement plate. The experiments were performed with the relatively low Reynolds number range of 250 ~ 2500. The surface temperature of the impingement plate was measured using an infrared camera, from which a heat loss (qe) in the in-plane direction and heat transfer coefficients were obtained. And the flow behavior of the jet was visualized by using a Laser Light Sheet(LLS)method. From the experiments, it was found that a heat loss (qe) needs to be considered in the case of a low Reynolds number and a small diameter.
